[SSSD] [sssd PR#947][comment] tests: fix race conditions in integration tests

[alexey-tikhonov]

URL: https://github.com/SSSD/sssd/pull/947
Title: #947: tests: fix race conditions in integration tests

alexey-tikhonov commented:
"""
Probably it makes sense to split this PR into two different?
"""

See the full comment at https://github.com/SSSD/sssd/pull/947#issuecomment-560439026